Question

Which antibiotic from the following contains N = N linkage?

• A. Sulphanilamide
• B. Prontosil
• C. Sulphapyridine
• D. Salvarsan

Hint:

Compounds containing –N=N– are classified as azo compounds and often show dye-like properties.

Answer 1

The Correct Option is B

Step 1: Recall the nature of N = N linkage.
An N = N linkage is known as an azo linkage, characteristic of azo dyes and related compounds.
Step 2: Analyze the given antibiotics.
Sulphanilamide: Does not contain an azo group.
Prontosil: Contains an azo (–N=N–) linkage connecting aromatic rings.
Sulphapyridine: Does not contain an azo linkage.
Salvarsan: Contains As–As linkage, not N=N.
Step 3: Conclusion.
Prontosil is the antibiotic that contains an N = N linkage.